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MongoDB C100DBA certification exam is designed for individuals who want to demonstrate their expertise in managing and administering MongoDB databases. As a highly recognized certification in the database industry, passing the C100DBA Exam validates the skills and knowledge required to perform essential tasks such as installing, configuring, and maintaining MongoDB deployments.

MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q140-Q145):

NEW QUESTION # 140
Consider that you have a collection called population which has fields state and city. Which of the following query will calculate the population grouped by state and city?

A. db.population.aggregate( [{ $group: { _id: { city: "$city" },pop: { $sum: "$pop" } } }] )Multi Document Transaction is not supported by MongoDB
B. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: "$pop" } } }] )
C. db.population.aggregate( [{ $group: { _id: { state: Estate", city: "$city" },pop: { $sum: 1 > > >] )
D. db.population.aggregate( [{ $group: { _id: { state: "$state", city: "$city" },pop: { $pop: 1 } } }] )

Answer: B

NEW QUESTION # 141
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

A. db.posts.createIndex({commerits.$.author":-l});
B. db.posts.createIndex({comments.author":-l});
C. db.posts.createIndex({comments.$.author": {$desc:l>});

Answer: B

NEW QUESTION # 142
In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

A. Put indexes on all of your documents
B. Properly defined user roles
C. The proper storage engine
D. Sharding
E. Replication

Answer: E

NEW QUESTION # 143
What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; "$author", x: { $sum: $likes } } } ] )

A. Number of posts by an author
B. Average of likes on all the posts of an author, grouped by author
C. Sum of likes on all the posts by an author, grouped by author
D. Sum of likes on all the posts by all the authors

Answer: C

NEW QUESTION # 144
In a sharded replicas set environment with multiple mongos servers, which of the following would decide the mongos failover?

A. mongo shell
B. mongod
C. individual language drivers
D. mongos

Answer: C

NEW QUESTION # 145
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